#play-button {
	background-color:black;
	border:0px;
	color:white;
	font-size:40px;
	position:fixed;
	left:50%;
	top:50%;
	width:5em;
	height:5em;
	transform: translate(-50%, -50%);
	z-index: 10;
	opacity:0.8;
	border-radius:20px;
}
#play-button:hover{
	opacity:0.95;
	box-shadow: 0px 0px 25px grey;
}
#pause-button {
	background-color:black;
	border:0px;
	color:white;
	font-size:12px;
	position:fixed;
	left:50%;
	top:95%;
	width:5em;
	height:5em;
	transform: translate(-50%, -100%);
	z-index: 10;
	opacity:0.3;
	border-radius:50px;
}
#pause-button:hover{
	opacity:0.95;
	box-shadow: 0px 0px 25px grey;
}
.mask{
	height:100%; 
	width:100%; 
	position:fixed; 
	_position:absolute; 
	top:0; 
	z-index:9; 
} 
.opacity{ 
	opacity:0.5; 
	filter: alpha(opacity=50); 
	background-color:#000; 
} 